[P-PS02] Lunar Science and Exploration

[PPS02-P09] Simultaneous 98-fps multi-band photometry and temperature evolution of a Geminid lunar impact flash

*Noriaki Arima¹, Tsubasa Aoki¹, Yuto Araki¹, Shinsuke Abe¹, Miho Kawabata², Ko Arimatsu³ (1.Nihon University, 2.Kyoto University, 3.Ishigakijima Astronomical Observatory)

Keywords:

Moon,lunar impact flash,meteoroid,Geminids

We report on the first simultaneous three-band (g, r, z) photometry of a lunar impact flash (LIF) with TriCCS on the 3.8 m Seimei Telescope during the 2025 Geminid meteor shower. The event began with a simultaneous three-band emission lasting three frames (~ 30 ms), with the z-band emission persisting for ~ 100 ms. While the r- and z-band data were consistent with a single-temperature blackbody model of T ~ 2800-3600 K, the g-band exhibited a significant systematic flux excess. This implies the existence of additional emission components beyond the single-temperature blackbody model inferred from previous works. In this presentation, we discuss the LIF event in detail and outline prospects for future work.